Iran said it had made progress in talks with Oman on management of the Strait of Hormuz, the strategic waterway crucial for oil and gas trade that both countries border.

Foreign ministry spokesman Esmaeil Baqaei said several rounds of negotiations were held in Iranian capital Tehran on Friday and Saturday between Iranian and Omani deputy foreign ministers.

The discussions focused on "common principles and operational mechanisms" for ensuring the safe passage of shipping through the strait while respecting the sovereign rights of the two states, Baqaei said.

He described the talks as "useful" and said progress had been made, adding that "technical and political consultations between the two sides were continuing".

Iran's army warned that the Middle East war would widen if the United States chose to press ahead with attacks on the Islamic republic, ahead of the visit of Israeli Prime Minister Benjamin Netanyahu to Washington.

"I believe that if the Americans once again fall for the Zionists' deception, or move in line with them, and insist on continuing the war, particularly through air strikes, geographically this will expand further," army spokesman Mohammad Akraminia told state television.

He said the war had already expanded to the Bab al-Mandab Strait at the entrance of the Red Sea, referencing the recent military flare-up between Yemen's Houthi rebels and Saudi Arabia.

The report says the decision follows concerns over shrinking US missile stockpiles, regional escalation and risks to Gulf allies.

A US naval blockade against Iran remains in full effect, the US military's Central Command (CENTCOM) said.

As of July 25, US forces had redirected 12 commercial vessels attempting to breach the blockade, disabled two that failed to comply and boarded two others to verify compliance, CENTCOM said in a statement on X.

US forces completed a verification boarding of the Comoros-flagged oil tanker M/T Charminar in the Arabian Sea earlier Saturday, after which the vessel continued its journey, according to the command.

Iranian Foreign Minister Abbas Araghchi and EU foreign policy chief Kaja Kallas discussed regional and international developments, including what Tehran said was Ukraine's attack on an Iranian commercial vessel in the Caspian Sea and tensions in the Strait of Hormuz, during a call.

Araghchi strongly condemned the attack in the Caspian Sea, according to a statement by Iran's Foreign Ministry.

He urged a "decisive response" from the UN Security Council, the European Union and the broader international community, asking them to hold accountable those responsible for and supporting the "criminal" attack.

A spokesperson for Iran's Revolutionary Guards said that Britain would become a "definite and legitimate target" if it supported the US in any war with Tehran, according to Iranian state broadcaster IRIB.

The spokesperson said any country, including Britain and Gulf states, that backed the US in a conflict would be considered a legitimate target, adding that US bombers had recently used British airfields.

The Iranian army claimed that "almost all" US military infrastructure in Iraq's Erbil had been destroyed during the recent conflict and said Tehran was now deploying attack drones more advanced than the Arash-2.

Speaking to Iranian state television, army spokesman Brig. Gen. Mohammad Reza Akraminia claimed Iran had inflicted serious damage on US military bases across the region, saying many of them had lost much of their operational capability.

Araghchi sees renewed opportunity for trust-building with Arab neighbours while reiterating that the Yemen crisis has no military solution.

Ukrainian President Volodymyr Zelenskyy has said that Ukraine had noted Russia was passing on its satellite observations in the Middle East to Iran to enable it to direct strikes in the region.

"Since the beginning of July, we have recorded active Russian satellite surveillance of the Gulf states and US military facilities located there. These images subsequently appear in Iran," Zelenskyy said in comments on X.